Client-wifi connectivity issues with WLAN


Consider the scenario in which you have set up the whole unifi network with WLAN and then you are ready to rock the world. Now you have got everything connected and working perfectly but the particular device like IOS/Windows/MAC/Android is having an issue connecting to the wifi and you are stuck!

In some cases, users may encounter issues with certain client devices being unable to connect to Wi-Fi or have specific performance issues that appear to only coincide with certain group or specific devices. For example, Android phones cannot connect to my UniFi network or iOS devices frequently disconnect on my network. These can be confusing and difficult issues to solve for network administrators especially since in many cases the root issue can be difficult to identify. 

So, to get rid of this kind of issues you must narrow down the scope of troubleshooting and find the root cause which could have an impact on such scenarios.

Compatibility of devices:

Alongside with UniFi, there are many variables involved with all the different devices, network drivers, wireless adapters, etc. that often go unnoticed/aren’t frequently considered. In most cases, issues assumed to be UniFi issues that are confined to a segment of client devices end up to be totally unrelated to UniFi. In some cases, you can change your UniFi configuration to help adapt your network to the limitations of your devices. For instance, fast roaming may not work well with all client devices depending on how old they are, how these products roam by default, etc. Many of the cases are always going to be related to the legacy and older devices in the market.

When an issue like this pop-up, it’s very important to narrow down the issue as much as possible to different client devices, software versions, etc. so that you will get to know where to look for the solution. Here are some good questions to ask when encountering such issues: 

  • How many devices are affected?
  • What do these devices have in common? Location? Device hardware? OS version? 
  • When did the issue start occurring? 
  • Does it occur in all cases or is it intermittent? Is the issue consistently reproducible? 
  • Is there an error message? 

Here are some tips and suggestions which are given good to resolve this conflict connecting unifi WLAN.

Diagnosis and tips from doctorunifi to improve connectivity with WLAN:

Since you know that I believe in providing a direct solution with some changes in unifi controller without making you read the whole world of data.
Here are some changes which you can make in unifi controller and get your self running. Please make sure you test the connectivity after each step you perform and if no go then move to the next step.

Important: Reboot client devices first when a small number of individual client devices are affected.
Important V2: Make sure that firmware on the all adopted device is at latest and controller version is updated as well.

1. Disable the “Auto optimize network” option from the settings>site.

Since this option was introuduced there are many complaints from the clients that it’s causing the connectivity issues. And since its in still beta phase I would suggest you disable this option till it gets stable.

2. Create a separate SSID (Name it as a test) in the new WLAN group. Then go to the device tab>select the AP> configuration>WLAN> then select the new WLAN group there in which the test SSID is created. Now try to connect to that SSID and check if you can connect.

3. Edit that WLAN group you have created and enable legacy device support (i.e. 11b) option and save and check.

4. Make sure you have the following options disabled:
*If all access points are wired then, disable “Uplink connectivity monitor“.
*Disable the “Block LAN to WLAN Multicast and Broadcast Data” from the wireless network settings.

* Disable the ” Fast roaming” from the wireless network settings, That option is still in beta and many of the old devices are not compatible with it.

5. This is some next level but you can try this in an extreme scenario where all of the above steps did not work. All you need to do is move the one of the adopted AP to the new site of the controller and test there.

Please click on the site on the top right corner and create a new site there.
Once a new site is created, go to settings >> wireless networks in the new site and create a new wireless network there.
Go back to the previous site where the AP’s are operating and click on the AP and go to Config >> manage device, and next to Forget, there will be an option of “Move to”, click on that and select the new site’s name.
Go to the new site, and once the AP shows as Connected there, try connecting to the SSID from that AP and check if you can connect fine.

6. Try eliminating any advanced features like RADIUS or fast roaming from your UniFi Configuration to ensure that they haven’t been improperly configured or that your devices do not support such configurations. Try to set up a parallel, simplified Wi-Fi network with a few modifications to default config as possible to see if the issue is eliminated.

7. Try updating wireless adapter drivers on client devices when a subset of devices with same wireless adapter is malfunctioning, or in individual cases. 

Other than all scenarios if issues affect all devices, this implies that the issue is more likely to be a result of poor configuration or a potential performance issue on the UniFi side.

I am pretty much sure that I have covered all the points and maybe I missed something but I am very sure that you will get your issue resolved with these steps, tips and my diagnosis.

If the issue still persists you have my email or the comment section is all yours. Also, if you find the article helpful please let me know I am very much hungry for appreciation an who doesn’t like that, right?


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